Bobebt w



R. W. BRYAN.

ANTIRATTLING GEAR.

APPLlcAloN FILED MAY26.191'9.

Patented Mar. 23, 1920.

ROBERT W. BRYAN, OF' ABERDEEN, WASHINGTON.

ANTIRAT'TLING GEAR.

Specification of Letters latent. Patented Mar, 23, 1920,` y

Application filed May 26, 1915*. Serial No. 299,786.

To ZZ cl2/tom t may concern: y

Be it known that I, ROBERT W.`BRYAN, a

v citizen of the United States, residing at Aberdeen, in the county of Grays Harbor and vState of Washington, have invented cerf tain new and useful Improvements in Antirattling Gears, of which the following is a specification, reference being had tothe accompanying drawings.

lThis invention relates to an anti-rattling gear, of the split type, and it is the aim not to limit the device to the particular construction herein shown and described, for it is obvious, equivalent constructions within the scope of what is claimed may be eniployed.

In the application of meshing gears, partieularly in automobile and other gasolene engines, the springs of the valves ofthe engine have a tendency to drive the driven gear ahead, that is after the valve stem passes the apex of the cam on the valve op-v erating shaft, thereby causing a rattling or clicking sound between the driving and driven gears, especially those as used on automobile engines. The present anti-rattling gear is designed to operate anti-ciccio wise.

Therefore, the object' of the present invention is to eliminate the rattling or clicking sound between the teeth of the driving and driven gears, by'overcoming the'tendency of the springs driving the driven gear ahead, that is after the contacting part of the valve passes the apex of the cam on the valve operating shaft.

This anti-rattling gear may be employed in connection with other machinery where gears are employed, equally as well as in connection with automobile or other gasolene engines.

The invention further aims to provide a split gea-r, that is split in a plane parallel with the sides of the gear, in fact affording a pair of gears, preferably flatwise adjacent each other, but not necessarily, for they may be arranged otherwise, in combination with spring connections between the two gears or the parts of the split gear, in order to take up the play between the teeth of a driving gear and the driven gear.

While the design and 'construction at present illustrated and set forth is deemed preferable, it is obvious that as a result of a reduction of the invention to a more practical form for commercial purposes, the invention may be susceptible tochanges, and.

the rightto these changes is claimed, provided they are comprehended within the scope of what is claimed.

.The invention comprises further and combination of parts, as will be hereinafter set forth, shown in the drawings andl claimed. f

In the drawings:

Figurel isa view in side elevation ofthe improved anti-rattling gear, yconstructed in accordance vwith the invention, showing a driving gear in mesh` therewith, and showing the casing for the resilient means in section, in order to disclose the mounting of the resilient means, whereby it may Contact with certain of the spokes of one ofthe sections or parts of the driven split gear.

Fig. 2 is a view ink edge elevation of the anti-rattlingsplit gear, showing the driving gear meshing therewith.

Fig. 3 is a sectional view on line 3--3 of Fig. l.

Referring more especially to the drawings, 1 `designates a conventional form of cam shaft, for operating the valves of anr auto-mobile or other Vgasolene engine, and formed with this shaft are the usual cams 2 for actuating thevalve. Formed on one end of the shaft is a fixed collar 3. Mounted on the end portion of the shaft adjacent the outer face of the collaris a driven gear Ll. Thisy i is split, thereby constructing a pair'of gear sections 5 and 6. Thesection 5 is fixed on the shaft adjacent the collar, while the section 6 is revolubly movable relatively to the fixed section. I-lowever, the revolubly movable section isheld fiatwise against the fixed section by means of the collar 7, which is threaded upon the shaft. The adjacent faces of the fixed and revolubly movable sections have interengaging parts 8 and 9, in order to insure concen tricity between the sections as they are revolving with the shaft. Constructed on the spokes or any other suitable location of the fixed section are casings il having bores l2, and arranged in the bores are anti-frictional spherical members 13, between which and the closed ends of the bores coil springs le are interposed. rlhese coil springs urge the spherical anti-frictional members in coutact with bearings of the spokes, or any other suitable part of the section which is movable relatively to the fixed section. Preferably, though not necessarily, the

features y spokes of the section which is movable relatively to the fixed section are provided with guide notches l5, to be engaged by the casings of the iiXed section.l The resilient coil springs have suiiicient tension, to move the section which is movable relatively to the fixed section, so'that the'teeth or cogs of the movable section are out of alinement with the teeth of the Xed section. By accomplishing this result, it is to be seen that when the teeth of the living gear 16. intermesh with the driven gear, and the shafts ot the driving and driven gears are in ixed positions, the teeth of the driving gear will cause'the teeth o the movable section to aline Vwith the teeth civ the iiXed section against the action of the coil springs. Obviously the coil springs will act to urge the movable section, in order that its teeth will at all times tend to become out of alinement with the teeth of the iixed section, and this tendency of the teeth oi"V one section become out ot registration with the teeth of, the

other section, will talieup the play betweenv the teeth ci: the driving and driven gears, thereby avoiding the rattling or clicking sound between the teeth, as the gears are revolving.

The invention having been set forth, what is claimed as new and useful is:

l. The combination with a driving gear and a driven gear, of a shaft on which the driven gear is mounted, said driven gear comprising a pair of gear sections, iiatwise adjacent each other, one section being fri-:ed to the shaft, the other section being relatively movable to the iixed section, certain of the spokes of the fixed section having dief metrically opposite housings provided with bores, the open ends of which face in opposite directions, certain oi the spokes of the relatively movable gear section having notches, in which the open ends of the housings are guided, spherical members mounted in the bores and protruding beyond theopen ends of the bores, to contact with the bottoms of the guides, resilient coil springs on the bores interposed between the spherical members and the closed ends of the bores, to resiliently urge the spherical members in Contact with the bottoms oi' the notches, thereby tending to position the relatively movable gear section so that its teeth tend to become out of alinement with the teeth of the Xed section, thereby taking up the play between the teeth of the driven gear andthe driving gear.

2. In a gearing, the combination with driving and driven gears, of a shaft on which the driven gear is mounted, said driven gear comprising a pair oi gear sections flatwise concentric and adjacent each other, one gear section being fixed to the shaft, the other being loose on the shaft and having a portion fitting within the marginal. rim or' the iixed gear section., the loose gear section having a web provided with openings causing parts oi the web to constitute spokes, diametrically opposite housings carried by the spokes of the iixed gear section and provided with sliding guide connections with the spokes of the loose gear section, said housings including yielda-ble means bearing upon and cooperating with the spokes orn the loose gear section, whereby the movable gear section tends to move so that its teeth will position out of alinement with the teeth of the fixed gear section, thereby taking up the play between the teeth of the driving and driven gears.

In testimony whereof hereunto aiiix my signature in the presence oitwo witnesses.

ROBERT lV. BRYAN. `Witnesses JAMES F. FULLER, J. MonsT COPELAND. 

